TF338 MicroSD Express 256GB review — A capable contender for Switch 2 storage

Summary

Nintendo’s Switch 2 ships with 256GB internal storage, but games keep ballooning — enter AGI Gear’s TF338 MicroSD Express. It comes in 128GB, 256GB and 512GB sizes and promises up to 800MB/s reads and 700MB/s writes, plus a rugged build (shock‑, water‑ and x‑ray resistant). I tested the 256GB model with titles like Mario Kart World and Wild Hearts S to see how it stacks up against the console’s internal UFS 3.1 storage.

The Switch 2’s internal UFS 3.1 is faster on paper (sequential reads up to ~2.1GB/s), and in practice the internal drive launched Mario Kart World about 1 second faster and Wild Hearts S roughly 5 seconds faster than the TF338. That said, the TF338 is still far quicker than older SD cards and perfectly usable for Switch 2 gaming. The main hangups are price and availability — listings in North America are scarce and the 256GB model can be much more expensive than competing cards.

Key Points

Available capacities: 128GB, 256GB and 512GB; review unit was the 256GB model.
Advertised speeds: up to 800MB/s read and 700MB/s write; built to be rugged and travel‑friendly.
Switch 2 uses 256GB UFS 3.1 internal storage (sequential reads up to ~2.1GB/s), so internal storage generally loads some games faster.
Real‑world results: Mario Kart World launched ~1s slower from the TF338; Wild Hearts S took ~5s longer — performance varies by title and access patterns.
Biggest negatives: limited availability (hard to source in some regions) and higher price compared with other 256GB microSD options.

Why should I read this?

Short and blunt: if you own a Switch 2 and need extra space, this card works and is fast compared with older SDs — but it won’t beat the console’s internal drive for some loads, and it’s annoyingly pricey and tricky to buy right now. We tested it so you don’t have to faff around discovering the same — quick verdict: good hardware, questionable value unless you find a decent price.